/* ==========================================================================
   Portfolio — Sarvesh Sawant
   Light + Minimal — Paper-like editorial aesthetic
   ========================================================================== */

/* --- Custom Properties --- */
:root {
  /* Colors */
  --color-bg: #F5F3EF;
  --color-bg-elevated: #FFFFFF;
  --color-bg-subtle: #EDE9E3;
  --color-text: #1A1A1E;
  --color-text-muted: #5C5C62;
  --color-text-dim: #8E8E96;
  --color-accent: #B8860B;
  --color-accent-hover: #9A7209;
  --color-accent-dim: rgba(184, 134, 11, 0.08);
  --color-border: #D6D2CC;
  --color-border-accent: #B8860B;
  --color-aws: #FF9900;

  /* Typography */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1120px;
  --reading-width: 720px;
  --nav-height: 64px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.4s;
  --duration-slow: 0.6s;
}

/* --- Reset --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

::selection {
  background-color: var(--color-accent-dim);
  color: var(--color-text);
}

/* --- Noise Overlay --- */
.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-text);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  z-index: 10001;
  border-radius: 0 0 4px 4px;
  transition: top var(--duration-fast);
}

.skip-link:focus {
  top: 0;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: transparent;
  transition: background-color var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.site-nav.scrolled {
  background: rgba(245, 243, 239, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-monogram {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
  transition: color var(--duration-fast);
}

.nav-monogram:hover {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-size: 0% 1px;
  background-position: left bottom;
  background-repeat: no-repeat;
  transition: color var(--duration-fast),
              background-size var(--duration-normal) var(--ease-out);
  padding-bottom: 2px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
  background-size: 100% 1px;
}

.nav-resume-btn {
  padding: 6px 16px !important;
  border: 1px solid var(--color-border) !important;
  border-radius: 4px;
  transition: border-color var(--duration-fast),
              color var(--duration-fast),
              background-color var(--duration-fast) !important;
  background-image: none !important;
  background-size: 0 !important;
}

.nav-resume-btn:hover {
  border-color: var(--color-accent) !important;
  color: var(--color-accent) !important;
  background-color: var(--color-accent-dim) !important;
  background-size: 0 !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast);
  transform-origin: center;
}

.nav-toggle.open .nav-toggle-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.open .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open .nav-toggle-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu-links {
  text-align: center;
}

.mobile-menu-links li {
  margin-bottom: var(--space-lg);
}

.mobile-menu-links a {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-text);
  transition: color var(--duration-fast);
}

.mobile-menu-links a:hover {
  color: var(--color-accent);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-3xl) var(--space-lg);
  padding-top: calc(var(--nav-height) + var(--space-3xl));
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding-left: 6%;
}

.hero-line {
  width: 60px;
  height: 1px;
  background: var(--color-accent);
  margin-bottom: var(--space-lg);
  transform-origin: left;
  opacity: 0;
  transform: scaleX(0);
  animation: lineExtend 0.8s var(--ease-out) 0.2s forwards;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s var(--ease-out) 0.4s forwards;
}

.hero-tagline {
  font-family: var(--font-body);
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s var(--ease-out) 0.7s forwards;
}

.hero-dot {
  margin: 0 0.6em;
  color: var(--color-accent);
}

.hero-intro {
  font-family: var(--font-body);
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--color-text);
  max-width: var(--reading-width);
  margin-bottom: var(--space-2xl);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s var(--ease-out) 0.9s forwards;
}

.hero-scroll {
  opacity: 0;
  animation: fadeIn 0.8s var(--ease-out) 1.3s forwards;
}

.hero-scroll-line {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite 1.5s;
}

/* ==========================================================================
   Sections — Shared
   ========================================================================== */
.section {
  padding: var(--space-3xl) var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-heading {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-2xl);
  position: relative;
  padding-bottom: var(--space-md);
}

.section-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 1px;
  background: var(--color-accent);
}

/* ==========================================================================
   Experience — Timeline
   ========================================================================== */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-2xl);
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 13px;
  height: 13px;
  border: 1.5px solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-bg);
  z-index: 1;
}

.timeline-card {
  padding: var(--space-lg);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  transition: border-color var(--duration-fast);
}

.timeline-card:hover {
  border-color: var(--color-accent);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.timeline-company {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--color-text);
}

.timeline-role {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-dim);
  white-space: nowrap;
}

.timeline-list {
  list-style: none;
}

.timeline-list li {
  position: relative;
  padding-left: 1.2em;
  margin-bottom: var(--space-sm);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text);
}

.timeline-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 5px;
  height: 5px;
  background: var(--color-accent);
}

.timeline-list li strong {
  font-weight: 600;
  color: var(--color-text);
}

.metric {
  font-style: normal;
  color: var(--color-accent);
  font-weight: 600;
}

/* ==========================================================================
   Projects
   ========================================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.projects-grid .project-card:first-child {
  grid-column: 1 / -1;
}

.project-card {
  padding: var(--space-lg);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  transition: border-color var(--duration-normal) var(--ease-out);
}

.project-card:hover {
  border-color: var(--color-accent);
}

.project-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 10px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.project-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-accent);
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-size: 0% 1px;
  background-position: left bottom;
  background-repeat: no-repeat;
  transition: background-size var(--duration-normal) var(--ease-out);
  padding-bottom: 1px;
}

.project-link:hover {
  background-size: 100% 1px;
}

.project-link svg {
  display: inline-block;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* ==========================================================================
   Skills
   ========================================================================== */
.skills-container {
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.skill-row {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  align-items: baseline;
}

.skill-row:last-child {
  border-bottom: none;
}

.skill-category {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-dim);
  min-width: 140px;
  flex-shrink: 0;
}

.skill-list {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text);
}

.certification {
  display: inline-block;
}

.cert-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--color-text);
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-size: 0% 1px;
  background-position: left bottom;
  background-repeat: no-repeat;
  transition: background-size var(--duration-normal) var(--ease-out);
  padding-bottom: 1px;
}

.cert-link:hover {
  background-size: 100% 1px;
}

.cert-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  background: var(--color-aws);
  color: #fff;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   Education
   ========================================================================== */
.education-card {
  max-width: var(--reading-width);
}

.edu-degree {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.edu-school {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.edu-meta {
  display: flex;
  gap: var(--space-lg);
}

.edu-date,
.edu-gpa {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-text-dim);
}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: var(--reading-width);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--duration-fast);
}

.contact-item:hover {
  border-bottom-color: var(--color-accent);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-dim);
}

.contact-value {
  font-size: 0.9rem;
  color: var(--color-text);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  letter-spacing: 0.04em;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes lineExtend {
  from {
    opacity: 1;
    transform: scaleX(0);
  }
  to {
    opacity: 1;
    transform: scaleX(1);
  }
}

@keyframes scrollPulse {
  0%, 100% {
    opacity: 0.4;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(8px);
  }
}

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* --- Focus Styles --- */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  .hero-line,
  .hero-name,
  .hero-tagline,
  .hero-intro,
  .hero-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ==========================================================================
   Responsive
   ========================================================================== */

/* --- Tablet & below (< 900px) --- */
@media (max-width: 899px) {
  :root {
    --space-3xl: 5rem;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content {
    padding-left: 0;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline-marker {
    left: -24px;
    width: 11px;
    height: 11px;
  }

  .timeline-header {
    flex-direction: column;
    gap: 2px;
  }

  .timeline-date {
    order: -1;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid .project-card:first-child {
    grid-column: 1;
  }

  .skill-row {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .skill-category {
    min-width: unset;
  }

  .contact-links {
    grid-template-columns: 1fr;
  }
}

/* --- Mobile (< 600px) --- */
@media (max-width: 599px) {
  :root {
    --space-3xl: 3.5rem;
    --space-2xl: 3rem;
  }

  .nav-inner {
    padding: 0 var(--space-md);
  }

  .section {
    padding: var(--space-2xl) var(--space-md);
  }

  .hero {
    padding: var(--space-2xl) var(--space-md);
    padding-top: calc(var(--nav-height) + var(--space-2xl));
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .hero-intro {
    font-size: 1rem;
  }

  .timeline-card {
    padding: var(--space-md);
  }

  .project-card {
    padding: var(--space-md);
  }

  .skills-container {
    padding: var(--space-md);
  }

  .mobile-menu-links a {
    font-size: 1.6rem;
  }
}